You could sit in silom villiage and wait for your order that will kill plenty of time(55) i wouldnt risk taking a cab anywhere because 2 hours isnt very long. If there was more time maybe a trip to central. Rachadaphisek rd isnt far

at the departure floor ,there is at least 1 small minimart with can beer anytime (also after 2pm) , very close to the outside air asia self-check-in machines, at the first (north) corner of terminal 1, when you arrive by taxi. there is a small pavillon outside to sit down. small can chang beer, i think 45.- baht

2 hours?

Go for an overpriced massage, then bowl of overpriced noodles, get barged out of the way by the Chinese hoards, and it's time for the connecting flight.